Percentile Calculator
Calculate the percentile rank of a value in a data set, or find the value at a given percentile. Supports both computations.
Enter a data set and percentile or value.
Percentile Formula
Percentile rank of x = (Number of values below x / Total number of values) × 100
Value at Pth percentile: Index = (P/100) × (n − 1)
Value at Pth percentile: Index = (P/100) × (n − 1)
How to Calculate Percentile
- Sort the data in ascending order.
- To find the value at percentile P: calculate the index i = (P/100) × (n−1).
- If i is a whole number, the value is data[i]. Otherwise, interpolate between adjacent values.
Example: Data: 10, 20, 30, 40, 50. Find the 75th percentile.
Index = (75/100) × (5−1) = 3
Value at index 3 = 40
Index = (75/100) × (5−1) = 3
Value at index 3 = 40
FAQ
What does the 90th percentile mean?
If your score is at the 90th percentile, it means you scored higher than 90% of the values in the data set.
Is percentile the same as percentage?
No. A percentage is a ratio out of 100. A percentile is a rank indicating what proportion of values fall below a given point in a distribution.
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Last updated: 2026-08-08